Warning signs about elevated levels of blue-green algae greeted visitors to a popular pond in Overland Park this week.

The water in the pond at South Lake Park west of 87th Street and Metcalf Avenue tested for high levels of the algae, which can make people sick.

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Experts advised the public to avoid direct contact with the water, especially in areas where algae is visible.

People are also urged to keep pets away from the water. Last year, the deaths of several dogs were linked to blue-green algae. Not only should pets not drink the water, they shouldn't get close enough to it to get wet because they might lick it from their paws, experts said.

Sara Gilgin said she and her dog walked right past the warning signs. She said she didn't know about the toxic algae until KMBC 9 News crews told her.

"If she did get too close, I would worry about her, so now I know to keep the dog away. It's good to know that," she said. "Maybe I should give her a bath when we get home, even. You never know."

Other park visitors said they had read the warning signs.

"Even though you're not allowed to swim in it (normally), try to stay away," said visitor Sam Slade. "If you accidentally fall in, wash as soon as you possibly can."

Contact with the algae can cause vomiting and diarrhea.

People who fish at South Lake are advised to clean the fish thoroughly and only consume the filet portion.